Insert clamping wedge and insert-detachable type cutter

Abstract

An insert clamping wedge for clamp-fixing a cutting insert, seated in an insert attachment seat formed in a cutter body, to a recessed portion formed in the insert attachment seat is provided, the insert clamping wedge including: a wedge body, wherein the insert clamping wedge is pressed into the cutter body, wherein the wedge body includes a clamp surface which comes into close contact with the cutting insert and a wedge surface of which a gap between itself and the clamp surface becomes smaller in a press-insertion direction of the wedge body, and wherein the section perpendicular to the press-insertion direction of the wedge body from the wedge surface to the clamp surface being formed in a bell shape.

1. An insert clamping wedge for clamp-fixing a cutting insert formed in a flat plate shape having a rake face and a seat surface, seated in an insert attachment seat formed in a cutter body, to a recessed portion formed in the insert attachment seat, the insert clamping wedge comprising:
 a wedge body; 
 wherein the insert clamping wedge is pressed into the cutter body, 
 wherein the wedge body includes a clamp surface which comes into close contact with the cutting insert and a wedge surface having a gap between itself and the clamp surface that becomes smaller in a press-insertion direction of the wedge body, 
 wherein the clamp surface includes a protrusion accommodated in a hole formed in the rake face of the cutting insert so as to maintain an engagement between the protrusion and the hole, and 
 wherein the protrusion has a shape such that a corner change operation can be carried out by allowing the cutting insert to be rotatable about the protrusion, when the insert clamping wedge and the cutting insert are drawn out to a rear side in a press-insertion direction in a range that the engagement between the protrusion and the hole so as to prevent dropping of the insert clamping wedge and the cutting insert from the cutter body. 
 
     
     
       2. An insert-detachable type cutter to which the insert clamping wedge according to  claim 1  is attached comprising:
 a cutting insert formed in a flat plate shape having a rake face and a seat surface; 
 a circular cutter body provided with recessed insert attachment seats which are formed in a circumferential direction at a predetermined interval so as to respectively seat the cutting inserts therein, and a recessed portion which is formed adjacent to each insert attachment seat; 
 an insert clamping wedge which is accommodated in each recessed portion and is pressed into a bottom of the recessed portion so as to press-fix the cutting insert to the insert attachment seat; and 
 a pressing member which presses the insert clamping wedge into the bottom of the recessed portion, 
 wherein the recessed portion is formed in a complementary shape with respect to the shape of the insert clamping wedge, and 
 wherein a circular hole is formed in a center of the rake face. 
 
     
     
       3. The insert clamping wedge according to  claim 1 , wherein the section of the protrusion parallel to the clamp surface is formed in a circular shape. 
     
     
       4. The insert clamping wedge according to  claim 1 , wherein the protrusion is formed in a spherical shape, a conical shape, or a conical trapezoid shape. 
     
     
       5. The insert clamping wedge according to  claim 1 , wherein at the boundary between the protrusion and the clamp surface, a recessed groove portion is formed so as to be recessed from the clamp surface.